Circular railway

The railway is to interconnect in a circular arc the points A, B, and C, whose distances are | AB | = 30 km, AC = 95 km, BC | = 70 km. How long will the track from A to C?

Correct result:

b1 =  103.1095 km

Solution:

c=30 b=95 a=70  s=a+b+c2=70+95+302=1952=97.5 S=s (sa) (sb) (sc)=97.5 (97.570) (97.595) (97.530)672.6522 km2  r=S/s=672.6522/97.56.899 km  R=a b c4 r s=70 95 304 6.899 97.574.1468 km  ΔRRb b2=R2+R22 R2 cosθ  θ=arccos(2 R2b22 R2)=arccos(2 74.146829522 74.14682)1.3906 rad  b1=θ R=1.3906 74.1468=103.1095 km

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